package com.xuecheng.media.service.jobhandler;

import com.xuecheng.base.utils.Mp4VideoUtil;
import com.xuecheng.media.mapper.MediaProcessMapper;
import com.xuecheng.media.model.po.MediaProcess;
import com.xuecheng.media.service.MediaFileProcessService;
import com.xuecheng.media.service.MediaFileService;
import com.xxl.job.core.context.XxlJobHelper;
import com.xxl.job.core.handler.annotation.XxlJob;
import lombok.extern.slf4j.Slf4j;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

import java.io.File;
import java.io.IOException;
import java.util.List;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

/**
 * 视频处理类
 */
@Slf4j
@Component
public class VideoTask {

    @Autowired
    MediaFileProcessService mediaFileProcessService;
    @Autowired
    MediaFileService mediaFileService;

    //ffmpegpath的路径
    @Value("${videoprocess.ffmpegpath}")
    private String ffmpegpath;


    /**
     * 分片广播
     * 视频处理任务
     */
    @XxlJob("videoJobHandler")
    public void shardingJobHandler() throws Exception {

        // 分片参数
        int shardIndex = XxlJobHelper.getShardIndex();//执行器的序号，从0开始
        int shardTotal = XxlJobHelper.getShardTotal();//执行器总数

        //确定cpu的核心数
        int processors = Runtime.getRuntime().availableProcessors();
        //查询待处理的任务
        List<MediaProcess> mediaProcessList = mediaFileProcessService.getMediaProcessList(shardIndex, shardTotal, processors);
        //任务数量  （最多取到cpu核数的数量的任务，可能取不到）
        int size = mediaProcessList.size();
        log.debug("取到的视频处理任务数:" + size);
        if (size <= 0) {
            return;
        }
        //创建一个线程池
        ExecutorService executorService = Executors.newFixedThreadPool(size);
        //使用的计算器
        CountDownLatch countDownLatch = new CountDownLatch(size);
        mediaProcessList.forEach(mediaProcess -> {
            //遍历将每个任务加入线程池
            executorService.execute(() -> {
                try {
                    //任务id
                    Long taskId = mediaProcess.getId();
                    //文件id就是md5
                    String fileId = mediaProcess.getFileId();
                    //开启任务
                    boolean b = mediaFileProcessService.startTask(taskId);
                    if (!b) {
                        log.debug("抢占任务失败，任务id:{}", taskId);
                        return;
                    }

                    //执行视频转码
                    //桶
                    String bucket = mediaProcess.getBucket();
                    //objectName    (下载下来是.avi后缀，转化后是.mp4后缀,两个对象名是不一样的)
                    String objectNameDown = mediaProcess.getFilePath();
                    //下载minio视频到本地
                    File file = mediaFileService.downloadFileFromMinio(bucket, objectNameDown);
                    if (file == null) {
                        log.debug("下载视频出错，任务id:{},bucket:{},objectName:{}", taskId, bucket, objectNameDown);
                        //保存任务处理失败的结果
                        mediaFileProcessService.saveProcessFinishStatus(taskId, "3", fileId, null, "下载视频到本地失败");
                        return;
                    }

                    //先创建一个临时文件，作为转换后的文件
                    File mp4File = null;
                    try {
                        mp4File = File.createTempFile("minio", ".mp4");
                    } catch (IOException e) {
                        log.debug("创建临时文件异常,{}", e.getMessage());
                        //保存任务处理失败的结果
                        mediaFileProcessService.saveProcessFinishStatus(taskId, "3", fileId, null, "创建临时文件异常");
                        return;
                    }

                    //源avi视频的路径
                    String video_path = file.getAbsolutePath();
                    //转换后mp4文件的路径
                    String mp4_path = mp4File.getAbsolutePath();
                    //创建工具类对象
                    Mp4VideoUtil videoUtil = new Mp4VideoUtil(ffmpegpath, video_path, mp4File.getName(), mp4_path);
                    //开始视频转换，成功将返回success，失败返回失败原因
                    String result = videoUtil.generateMp4();
                    if (!result.equals("success")) {
                        log.debug("视频转码失败,原因:{},bucket:{},objectName:{}", result, bucket, objectNameDown);
                        mediaFileProcessService.saveProcessFinishStatus(taskId, "3", fileId, null, result);

                    }
                    //上传到minio
                    //mp4在minio的存储路径
                    String objectNameUp = getFilePath(fileId, ".mp4");
                    boolean b1 = mediaFileService.addMediaFilesToMinIO(mp4File.getAbsolutePath(), "video/mp4", bucket, objectNameUp);
                    if (!b1) {
                        log.debug("上传mp4到minio失败,taskId:{}", taskId);
                        mediaFileProcessService.saveProcessFinishStatus(taskId, "3", fileId, null, "上传mp4到minio失败");
                    }
                    //mp4文件的url
                    String url = "/" + bucket + "/" + getFilePath(fileId, ".mp4");

                    //只在任务状态为成功
                    mediaFileProcessService.saveProcessFinishStatus(taskId, "2", fileId, url, null);

                } finally {
                    //计算器减1
                    countDownLatch.countDown();

                }


            });
        });

        //阻塞,指定最大限制的等待时间，阻塞最多等待一定时间后就解除阻塞
        countDownLatch.await(30, TimeUnit.MINUTES);

    }



    /**
     * @description: 获取文件路径
     * @params: [fileMd5, fileExt]
     * @return:
     * @author: ajie
     * @date: 2024/1/24 13:27
     */
    private String getFilePath(String fileMd5, String fileExt) {
        return fileMd5.substring(0, 1) + "/" + fileMd5.substring(1, 2) + "/" + fileMd5 + "/" + fileMd5 + fileExt;
    }


}
